Monday

The Nike+ system, one of the first personal speedometers, has been used by more than 2.5 million runners since its release in 2006.

[Source]

About the author:

Iqbal Mohammed is Head of Innovation & Strategy at a digital innovation agency serving the DACH and wider European markets. He is the winner of the WPP Atticus Award for Best Original Published Writing in Marketing & Communication.
You can reach him via email.